Kevin Smith says he survived a "massive" heart attack after a performance at the Alex Theatre in Glendale, California Sunday. 

In a tweet late Sunday night, the prolific writer/director revealed a doctor told him he would have died if he hadn't canceled the second previously scheduled Kevin Smith Live! performance of the evening. Smith, who first noticed something was wrong between sets when he vomited and started "sweating buckets," ultimately learned that his left anterior descending artery was entirely blocked.

Smith gave fans a more detailed update via his Facebook page, where he detailed his gratitude for the medical professionals who saved his life and joked that he was briefly worried missing the chance to craft Jay and Silent Bob Reboot. "When the time came, I never imagined I'd ever be able to die with dignity," Smith said. "I assumed I'd die screaming, like my Dad (who lost his life to a massive heart attack). But even as they cut into my groin to slip a stent into the lethal Widow-Maker, I was filled with a sense of calm. I've had a great life: loved by parents who raised me to become the individual I am. I've had a weird, wonderful career in all sorts of media, amazing friends, the best wife in the world, and an incredible daughter who made me a Dad."

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The Comic Book Men host added that he's now considering a shift to veganism, among other lifestyle changes. "I don't want my life to end, but if it ends, I can't complain," he said. "It was such a gift." Read his full post here.

Smith is currently working on a new horror movie titled Kilroy Was Here. When announcing the film last year, Smith said his story exists in the same vein as classics like Stephen King and George A. Romero's Creepshow. "This is a monster movie in the sense of a classic morality tale," he said.